These images are up to 360x360. The program which generates them will be shown in the future. As the images get larger, it may be useful to use the same array for storing both the present and next generation, especially if 3-d fractals are created. (Some compilers of some languages place a limit to the space available for array storage.) There is a nice programming 'trick' for that: For even passes, all output cells are placed two columns to the right of their proper location (if a 3x3 mask is employed). However, for odd passes, cells are placed two columns to the left of their proper location. For even passes, the image is scanned from left to right, but from right to left for odd passes.
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